I got to try out the X1 in white and green at the SHOT Show. The white was brighter than my Arc AAA, because the lens creates a very tight hot spot. It's hard to say how usefull this will be in the real world. With a green LED, it was very bright, almost as bright as my Badboy 400 that I brought for comparison. Once again, a tight spot. Much tighter than the Badboy with NXO5 optic.
As far as quality goes, it looked and felt as good as the X5T. The octagonal shape might help to keep the light from sliding in your hand like the older X5T, however, I think the rougher finish they are using now is of greater benefit.
Overall, a nice light that I will be buying, even though I'm not sure where it will be useful in my light lineup. Too big for a key chain. Not any easier to carry than an Arc LS, and not as bright either.
Why buy it then? Because it's cool. Who said our lights always had to be practical?